Hello;I have a windows Xp Pro SP2 Machine,2 WD ATA100 Hardisc's on primary,Master,Slave,and A Dvd Burner on the secondary,Master..Drice C is a 200gig drive with only 40gig used,drive D is a 320gig drive with 195gig used.Every once in a while intermittent,I'll be sitting there doing nothing,computer on,and all of a sudden,I here a clunk,the harddrive light is on steady,computer freezes,sometime blue screen,and sometime it recovers itself,and unfreezes??so I'm not righting or reading to the drive when it happens.I have taken out the D drive,and ran Western Digitals first 2 tests on there Diag.software and they pass,I ran this drive in another computer for 6hr stright,I don't think it's the Drive? and I can't find anything wrong with it? I have been running the computer with just the C drive single,no jumper,on the primary,and the dvd on the secondary for 2 days now,and it dosen't do it? I don't know if it's the harddrive or something in windows xp or what??Any Idea's on this weird thing going on when I put the D drive back in,What could be causing this?? Ran virus checks,spyware scans ect.all clean.Baffled on this one? The D drive is a little over a year old.